Diamond tool



April 9 F. E. KOEBEL 7 2,073,201

DIAMOND TOOL Filed Nov. 24, 1936 Bxwyze l3 Lib-6:4

Invert tor,

Frank E. K0ebel,

1 By wdl fia Attorney.

Patented Apr. 20, 1937 2.078.201 DIAMOND 'rooL Frank E. Koebel, GlenRidge, N.'J., assignor to J. K. Smit & Sons, Inc., New York, N. Y., acorporation of New York Application November 24, 1936, Serial No.112,515

3 Claims.

This invention relates to a tool consisting of a head and diamond set inthe end of the head to be used chiefly for dressing grinding-wheels inthe manner set forth in my United States Patent No. 2,047,147, datedJuly 7, 1936. The object of the invention is to provide a free flow ofcooling water supply immediately around the cutting point of the diamondand through passageways in the head in which the diamond is set, and theconstruction is such that the .passageways are conveniently formed inthe process of construction and additional radiating surface provided bymeans of fins exposed to the water for the dissipation of heat. Afurther object is i to provide a construction by which the diamond isfirmly held by the head. The tool also has advantages where dry dressingis necessary since the fins and passageways afford exposed surfaces forair cooling.

In the accompanying sheet of drawing which forms a part of thisdescription the tool is drawn to an enlarged scale.

Figure 1 is a side elevation of the tool.

Fig. 2 is a partial longitudinal section on the line II--II of Fig. 1.

Fig. 3 is an end view.

A suitable size for the tool is usually between a half and two-thirds ofan inch in diameter.

A head consisting of a steel socket piece Ill and a bronze plug II has adiamond l2 firmly set in the end of the plug. Holes l3 are drilled inthe rim of the socket piece and parallel to the axis of the tool and thesocket is bored out so that it will partially cut away the sides of theholes.

Circumferential grooves l4 are turned in the periphery of the socket tosuch depth that they will communicate with the parallel holes. Fins willbe left between the grooves and afford additional cooling surface. ,Theplug is made two to three thousandths of an inch larger in diameter thanthe socket so that it will be a tight fit when driven in. In the bottomof the socket a hardened piece, suitably a steel ball I5, is set at theback of the plug. By reason of the limited area of contact with the ballthe end of the plug will be indented when driven in, the metal upset andthe plug expanded so as to more firmly bind in the socket.

The ball does not entirely fill the space between the back end of theplug and the bottom of the socket and this space serves as apassageway 1. A diamond tool comprising a head and a diamond set in theend of the head and havin parallel holes surrounding the diamondsetting, a passageway" interconnecting the holes at the back of thesetting and circumferential grooves in the periphery of the head whichcommunicate with the parallel holes to provide for circulation of wateraround the setting.

2. A diamond tool comprising a head and a diamond, the head consistingof a socket piece and a plug contained in the socket with the diamondset in the end of the plug, the rim of the socket piece having parallelholcs with sides partially cut away so as to be in communication withthe socket space and open to the surface of the plug and circumferentialgrooves in the periphery of the head which communicate with the parallelholes to provide for circulation of water around the plug.

3. A diamond tool comprising a head and a diamond, the head consistingof a socket piece and a plug contained in the socket with the diamondset in the end of the plug, the rim of the socket piece having parallelholes with sides partially cut away so as to be in communication withthe socket space and open to the surface of the plug and circumferentialgrooves in the periphery which communicate with the parallel holes toprovide for circulation of water around the plug, and a hardened ballbetween the rear end of the plug and the bottom of the socket with alimited area of contact against the plug, whereby when the plug isdriven against the ball it will be indented and expanded so as to bemore firmly bound in the socket. 7 FRANK E. KOEBEL.

